Note that there was a post from a user who noted that having ADI compatibilty not only provides ADI flash compatibility but also fine-tunes the response of the SSS (super-steady-shot) mechanism by using the distance information transmitted by the 3-extra contact points of the D-type (or ADI compatible) lens.
Also, unlike the original design intent (ADI flash compatibility), there are additional functions that the 3 extra contact points of a D-type lens does, including allowing the back-and-forth communication necessary with an SSM lens. Obviously this means that AF is also being fine-tuned via the distance information transmitted via the D-type lens.
Bottomline, I personally would pay the additional money for a D-type lens, if I have a choice. Obviously when it comes to the 100/2 or the 35mm f/2, there is no D-type alternative and hence there is no choice there.
Among the Alpha 50mm f/1.4 lenses, only the Sony version is D-type with all others being non-D. Among the 50mm f/2.8 Macro alternatives, the Sony is D-type and the later KM alternatives were also D-type.